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Frost Measurement Sensors for Demand Defrost Control Systems: Purposed Applications in Evaporators

In: Transactions on Engineering Technologies

Author

Listed:
  • Martim Lima de Aguiar

    (University of Beira Interior and C-MAST – Centre for Mechanical and Aerospace Science and Technologies)

  • Pedro Dinis Gaspar

    (University of Beira Interior and C-MAST – Centre for Mechanical and Aerospace Science and Technologies)

  • Pedro Dinho da Silva

    (University of Beira Interior and C-MAST – Centre for Mechanical and Aerospace Science and Technologies)

Abstract

It is widely known that defrosting operation on commercial refrigerators is one of the main causes of inefficiency on these systems. Several defrosting methods are used nowadays, but the most commonly used are still time-controlled defrosting, usually by either electric resistive heating or reverse cycle, as most demand defrost methods are usually complex, expensive or unreliable. Demand defrost can work by either predicting frost formation by processing measured conditions (fin surface temperature, air humidity and air velocity) and/or frost accumulation symptoms such as pressure drop and refrigerant properties. Other way of knowing when to defrost is to directly measure the frost formation using sensors such as photoelectric, capacitive or resistive. This review gathers some of the methods that can be used for directly measuring frost accumulation on the evaporator fin surface.

Suggested Citation

  • Martim Lima de Aguiar & Pedro Dinis Gaspar & Pedro Dinho da Silva, 2019. "Frost Measurement Sensors for Demand Defrost Control Systems: Purposed Applications in Evaporators," Springer Books, in: Sio-Iong Ao & Len Gelman & Haeng Kon Kim (ed.), Transactions on Engineering Technologies, chapter 0, pages 159-171, Springer.
    • Handle: RePEc:spr:sprchp:978-981-32-9531-5_12
    DOI: 10.1007/978-981-32-9531-5_12
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